17 What is the best summary of the article?
A Concrete is a popular material, but it can develop cracks over time. Microbiologist Hendrik
Jonkers believes that adding bacteria to concrete can help remedy this problem and
provide savings for the construction industry.
B Hendrik Jonkers, a Dutch microbiologist, noticed that concrete cracks over time. He
decided to add bacteria to concrete to make a substance called bioconcrete. The bacteria
are placed inside plastic capsules that are mixed into wet təncrete.
C A Dutch microbiologist named Hendrik Jonkers became interested in investigating how
bacteria might be applied to concrete to fill cracks in concrete caused by water. He
developed a self-healing bioconcrete that works to make concrete more durable.
D Microbiologist Hendrik Jonkers wondered if concrete could repair itself in the same way
that human bones do. He developed bioconcrete, which was used to build a lifeguard
station near a lake in the Netherlands and repair an irrigation system in Ecuador.